Update Ownership library documentation for setting ownership on deployment

[bitzoic]

Motivation

Description

You can now set ownership on deployment without needing to call the set_ownership() or a constructor function. To set the ownership on deployment, add the address to the storage block:

storage {
    owner: Ownership = Ownership::initalized(Identity::Address(Address::from(0x0000000000000000000000000000000000000000000000000000000000000000))),
}

Motivation

This is shown in the inline documentation but not documented properly in the README.